constant return

基本解釋

Figure 1: Reduced costs, constant return
圖 1: 成本降低，利潤不變
ROI variation 1: Cost reduction, constant return
投資回報變體 1：成本降低，利潤不變
The clean operating department applies eight unattached clean air conditioning systems, and applies the secondary return air systems with the constant return air rate.
潔凈手術部采用八個獨立的凈化空調(diào)系統(tǒng) ，采用固定一、二次回風比的二次回風系統(tǒng) ，潔凈手術室送風裝置采用阻漏式潔凈送風天花。

So this line or these lines of code up here are arguably constant time steps to say if N is less than 2 in return, that it will always take maybe one step, maybe two steps, some number of fixed CPU cycles.
如果N小于2并返回,那么這些行所對應的代碼,通常只需要執(zhí)行一步，或者兩步，具體數(shù)字與CPU周期有關。
哈佛公開課 - 計算機科學課程節(jié)選

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